Question 3
A group of friends give one another gifts according to these rules:
- Nobody may give a gift to themselves.
- Every friend must give one gift.
- Every friend must receive one gift.
They record the actions with arrows pointing from giver to recipient. For example, the picture below shows cat giving to mouse and mouse giving to cat.
Which gift-giving arrangement below does not follow the rules?
- Nobody may give a gift to themselves.
- Every friend must give one gift.
- Every friend must receive one gift.
They record the actions with arrows pointing from giver to recipient. For example, the picture below shows cat giving to mouse and mouse giving to cat.
Which gift-giving arrangement below does not follow the rules?
